From the Cover: Catalytic Antioxidant Rescue of Inhaled Sulfur Mustard Toxicity

Area of Science:

• Toxicology
• Pharmacology
• Biochemistry

Background:

• Sulfur mustard (SM) is a potent chemical warfare agent causing severe tissue injury.
• SM-induced toxicity is exacerbated by reactive oxygen species and subsequent oxidative stress.
• Secondary inflammation further contributes to the detrimental effects of SM exposure.

Purpose of the Study:

• To evaluate the efficacy of a catalytic antioxidant, AEOL 10150, as a medical countermeasure against SM inhalation.
• To determine if AEOL 10150 can mitigate SM-induced oxidative stress and inflammation.
• To assess the impact of AEOL 10150 on survival and injury markers following SM exposure.

Main Methods:

• Adult male rats were exposed to a lethal dose of SM (1.4 mg/kg).
• Rats received subcutaneous injections of either PBS or AEOL 10150 (5 mg/kg) every 4 hours, starting 1 hour post-exposure.
• Survival, clinical scores, blood oxygen saturation, and tissue injury markers were assessed up to 72 hours post-exposure.

Main Results:

• Catalytic antioxidant treatment with AEOL 10150 significantly improved survival by up to 52% compared to PBS treatment.
• AEOL 10150 enhanced blood oxygen saturation by 10% and reduced clinical scores by 57%.
• Treatment decreased airway cast formation by 69% and attenuated SM-induced lung lipid oxidation, nitrosative stress, and pro-inflammatory cytokines.

Conclusions:

• Catalytic antioxidant therapy with AEOL 10150 demonstrates significant protective effects against inhaled sulfur mustard.
• AEOL 10150 effectively alleviates SM-induced oxidative stress and inflammation, improving key survival and injury markers.
• These findings suggest that catalytic antioxidants represent a promising therapeutic strategy for mitigating the toxic effects of sulfur mustard exposure.